Add a language level assessment test: It would be great to introduce a test to determine a user’s language proficiency level for further learning. A dedicated section for this would be very useful.

The language test is added! You can go through it when you first install the app, or you can sign out of your current account and then choose "Continue" in guest mode instead of "Log in".

Hi, please see here: https://duocards.com/en/faqs/#query-language-level